/in/foo.cc: In function 'int main()':
/in/foo.cc:27:8: warning: unused variable 'j' [-Wunused-variable]
  int m,j,k,l,i,o,p;
        ^
/in/foo.cc:27:12: warning: unused variable 'l' [-Wunused-variable]
  int m,j,k,l,i,o,p;
            ^
/in/foo.cc:27:16: warning: unused variable 'o' [-Wunused-variable]
  int m,j,k,l,i,o,p;
                ^